/**
 * @License: (C) Copyright 2013-2022
 * @Contact: abcque@outlook.com
 * @IDE: IntelliJ IDEA
 * @Encoding: utf-8
 * @Project: st2214 2215
 * @Package: PACKAGE_NAME
 * @File: CircleArea.java
 * @Time: 2022/11/9 21:00
 * @Author: abcque
 * @Description:
 * @Modifier
 * @ModifyDate
 * @ModifyRemark
 */
public class CircleArea {
    public static void main(String[] args) {
        // 使用面积公式计算圆的面积
        // System.out.println(3.1415926 * 2 * 2);
        int radius = 2;
        System.out.println(3.1415926 * radius * radius);
    }
}
